US9606163B2 - Ground fault detecting circuit and power converting device including the same - Google Patents
Ground fault detecting circuit and power converting device including the same Download PDFInfo
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- US9606163B2 US9606163B2 US14/390,118 US201214390118A US9606163B2 US 9606163 B2 US9606163 B2 US 9606163B2 US 201214390118 A US201214390118 A US 201214390118A US 9606163 B2 US9606163 B2 US 9606163B2
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- 239000007858 starting material Substances 0.000 claims description 27
- 229910001219 R-phase Inorganic materials 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 230000018199 S phase Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- G01R31/025—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
- H02H3/165—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems for three-phase systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/12—Monitoring commutation; Providing indication of commutation failure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
Definitions
- the present invention relates to a ground fault detecting circuit and a power converting device including the same, and in particular relates to a ground fault detecting circuit for detecting a ground fault and a power converting device including the same.
- a thyristor starter is provided with a converter configured to convert three-phase AC power of a commercial frequency to DC power, a DC reactor configured to smooth the DC power, and an inverter configured to convert the DC power supplied from the converter through the intermediary of the DC reactor to three-phase AC power of a desired frequency and supply the converted three-phase AC power to a synchronous motor through first to third AC lines.
- a converter configured to convert three-phase AC power of a commercial frequency to DC power
- a DC reactor configured to smooth the DC power
- an inverter configured to convert the DC power supplied from the converter through the intermediary of the DC reactor to three-phase AC power of a desired frequency and supply the converted three-phase AC power to a synchronous motor through first to third AC lines.
- PTD 1 Japanese Patent Laying-Open No. 2003-61380
- a ground fault detecting circuit is provided for detecting a ground fault. If a ground fault is detected by the ground fault detecting circuit, the operation of the thyristor starter will be stopped.
- a conventional ground fault detecting circuit there is one achieved by connecting a three-phase transformer to the first to third AC lines between the thyristor starter and the synchronous motor, and configured to detect the occurrence of a ground fault on the basis of an output voltage from the three-phase transformer (for example, see Japanese Patent Laying-Open No. 2009-131048 (PTD 2), Japanese Patent Laying-Open No. 2010-130704 (PTD 3), and Japanese Patent Laying-Open No. 2011-130634 (PTD 4)).
- PTD 2 Japanese Patent Laying-Open No. 2009-131048
- PTD 3 Japanese Patent Laying-Open No. 2010-130704
- PTD 4 Japanese Patent Laying-Open No. 2011-130634
- a conventional ground fault detecting circuit there is another one in which one terminal of a first resistance element and one terminal of a second resistance element are connected to two input terminals of an inverter, respectively, a third resistance element is connected between the other terminals of the first and second resistance elements and a line of a ground voltage, and configured to detect the occurrence of a ground fault on the basis of a voltage across the terminals of the third resistance element (for example, see “Thyristor Starter Used in Thermal Power Station”, Mitsubishi Electric Technical Report, Vol. 67, No. 5, 1993 (NPD 1)).
- a major object of the present invention to provide a ground fault detecting circuit which is compact in size, cheap in price and high in accuracy, and a power converting device including the same.
- a ground fault detecting circuit is configured to detect the occurrence of a ground fault in a power converting device which converts a first three-phase AC power to DC power, converts the DC power to a second three-phase AC power, and supplies the second three-phase AC power to a load through first to third AC lines, and includes first to fourth resistance elements.
- One terminals of the first to third resistance elements are connected to the first to third AC lines, respectively, the other terminals of the first to third resistance elements are commonly connected to one terminal of the fourth resistance elements, and the other terminal of the fourth resistance element is configured to receive a ground voltage.
- the ground fault detecting circuit further includes a determination circuit configured to determine whether or not the ground fault has occurred in the power converting device on the basis of a voltage across the terminals of the fourth resistance element.
- a power converting device includes a converter configured to convert a first three-phase AC power to DC power, a DC reactor configured to smooth the DC power, an inverter configured to convert the DC power supplied from the converter through the intermediary of the DC reactor to a second three-phase AC power, and supply the second three-phase AC power to a load through first to third AC lines, a ground fault detecting circuit configured to detect a ground fault in the power converting device, and a control circuit configured to stop the operation of the power converting device when the ground fault has been detected by the ground fault detecting circuit.
- the ground fault detecting circuit includes first to fourth resistance elements.
- the ground fault detecting circuit further includes a determination circuit configured to determine whether or not the ground fault has occurred in the power converting device on the basis of a voltage across the terminals of the fourth resistance element.
- the determination circuit determines that the ground fault has occurred in the power converting device when the voltage across the terminals of the fourth resistance element is greater than a predetermined voltage.
- the determination circuit includes an absolute value calculator configured to calculate an absolute value of the voltage across the terminals of the fourth resistance element, and a comparator configured to output a signal representing that the ground fault has occurred in the power converting device when the absolute value calculated by the absolute value calculator on the voltage across the terminals of the fourth resistance element is greater than a predetermined value.
- the frequency of the second three-phase AC power is variable
- the load is a synchronous motor
- the power converting device is a thyristor starter for starting the synchronous motor.
- the thyristor starter starts a synchronous generator in a power plant as the synchronous motor.
- one terminals of the first to third resistance elements are connected to the first to third AC lines, respectively, the other terminals of the first to third resistance elements are commonly connected to one terminal of the fourth resistance elements, and the other terminal of the fourth resistance element is configured to receive a ground voltage.
- the determination circuit determines whether or not the ground fault has occurred in the power converting device on the basis of a voltage across the terminals of the fourth resistance element. Since a current does not flow through the fourth resistance element in the normal state and flows through the fourth resistance element after the occurrence of a ground fault, it is possible to detect the occurrence of the ground fault at a high accuracy. Moreover, since no three-phase transformer is used, it is possible to make the device compact in size and cheap in price.
- FIG. 1 is a circuit block diagram illustrating the configuration of a thyristor starter according to an embodiment of the present invention
- FIG. 2 is a circuit diagram illustrating the configuration of a converter and an inverter illustrated in FIG. 1 ;
- FIG. 3 is a circuit block diagram illustrating the configuration of a ground fault detecting circuit illustrated in FIG. 1 ;
- FIG. 4 is a circuit block diagram illustrating a comparative example of an embodiment of the present invention.
- FIG. 5 is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in a R-phase line illustrated in FIG. 2 ;
- FIG. 6 is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in a high-voltage input terminal of the inverter illustrated in FIG. 2 ;
- FIG. 7 is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in a low-voltage input terminal of the inverter illustrated in FIG. 2 ;
- FIG. 8 is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in a high-voltage input terminal of the converter illustrated in FIG. 2 ;
- FIG. 9 is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in a U-phase line illustrated in FIG. 2 ;
- FIG. 10 is a circuit block diagram illustrating a modification of an embodiment of the present invention.
- a thyristor starter is configured to receive three-phase AC power from an AC power supply 1 so as to start a synchronous motor 8 , and is provided with a three-phase transformer 2 , a converter 3 , a DC reactor 4 , an inverter 5 , a ground fault detecting circuit 6 and a control circuit 7 .
- Three-phase transformer 2 converts a three-phase AC voltage of a commercial frequency supplied from AC power supply (power system) 1 to a predetermined three-phase AC voltage.
- the three-phase AC voltage generated by three-phase transformer 2 is supplied to converter 3 through a U-phase line UL, a V-phase line VL and a W-phase line WL.
- Converter 3 converts the three-phase AC power supplied from three-phase transformer 2 to DC power.
- DC reactor 4 is connected between a high-voltage output terminal 3 a of converter 3 and a high-voltage input terminal 5 a of inverter 5 for smoothing the DC power generated by converter 3 .
- a low-voltage output terminal 3 b of converter 3 is directly connected to a low-voltage input terminal 5 b of inverter 5 .
- DC reactor 4 may be connected between low-voltage output terminal 3 b of converter 3 and low-voltage input terminal 5 b of inverter 5 .
- DC reactor 4 may be connected between high-voltage output terminal 3 a of converter 3 and high-voltage input terminal 5 a of inverter 5 and between low-voltage output terminal 3 b of converter 3 and low-voltage input terminal 5 b of inverter 5 , respectively.
- Inverter 5 converts the DC power supplied from converter 3 through the intermediary of DC reactor 4 to three-phase AC power of a desired frequency and supplies the converted three-phase AC power to synchronous motor 8 through a R-phase line RL, an S-phase line SL and a T-phase line TL.
- Synchronous motor 8 is driven to rotate by the three-phase AC power supplied from inverter 5 .
- the rotational speed (revolutions/min) of synchronous motor 8 increases gradually.
- the switching frequency of inverter 5 increases in accordance with the rotational speed of synchronous motor 8 .
- the frequency of the three-phase AC power increases gradually from 0 to the predetermined value.
- FIG. 2 is a circuit diagram illustrating the configuration of converter 3 and inverter 5 .
- converter 3 includes thyristors 11 to 16 .
- the anodes of thyristors 11 to 13 are connected to U-phase line UL, V-phase line VL and W-phase line WL, respectively, and the cathodes thereof are commonly connected to high-voltage output terminal 3 a .
- the cathodes of thyristors 14 to 16 are connected to U-phase line UL, V-phase line VL and W-phase line WL, respectively, and the anodes thereof are commonly connected to low-voltage output terminal 3 b .
- Thyristors 11 to 16 are controlled by control circuit 7 . By switching on thyristors 11 to 16 at predetermined timings, it is possible to convert the three-phase AC power to the DC power.
- Inverter 5 includes thyristors 21 to 26 .
- the anodes of thyristors 21 to 23 are commonly connected to high-voltage input terminal 5 a , and the cathode thereof are connected to R-phase line RL, S-phase line SL and T-phase line TL, respectively.
- the anodes of thyristors 24 to 26 are connected to R-phase line RL, S-phase line SL and T-phase line TL, respectively, and the cathodes thereof are commonly connected to low-voltage input terminal 5 b .
- Thyristors 21 to 26 is controlled by control circuit 7 . By switching on thyristors 21 to 26 at predetermined timings, it is possible to convert the DC power to the three-phase AC power of a desired frequency.
- ground fault detecting circuit 6 is such a circuit that detects the occurrence of a ground fault in the thyristor starter. As illustrated in FIG. 3 , ground fault detecting circuit 6 includes resistance elements 31 to 34 , an amplifier 35 and a comparator 36 .
- resistance elements 31 to 33 are connected to R-phase line RL, S-phase line SL and T-phase line TL, respectively, and the other terminals thereof are commonly connected to a node N 31 .
- One terminal of resistance element 34 is connected to node N 31 , and the other terminal of resistance element 34 is connected to a line of a ground voltage GND.
- Amplifier 35 amplifies a voltage V 31 across the terminals of resistance element 34 .
- Comparator 36 compares an output voltage V 35 from amplifier 35 with a predetermined reference voltage VR, and outputs a signal ⁇ D at a level in accordance with the comparison result.
- signal ⁇ D is set to an “L” level.
- signal ⁇ D is set to an “H” level.
- a point that is grounded (for example, R-phase line RL) is connected to the other terminal of resistance element 34 (the line of ground voltage GND) to form a current flowing loop, and thereby, voltage V 31 is generated across the terminals of resistance element 34 .
- VR ⁇ V 35 and thereby, signal ⁇ D is set to the “H” level which is an active level.
- Control circuit 7 receives signals representing an input current to converter 3 , an output voltage from inverter 5 , a rotational speed of synchronous motor 8 and the like from a plurality of sensors (not shown), and controls converter 3 and inverter 5 on the basis of the signals received.
- control circuit 7 gradually increases the frequency of the three-phase AC power output from inverter 5 from 0 to the predetermined value.
- control circuit 7 stops the operation of converter 3 and inverter 5 and switches off a plurality of breakers (not shown) so as to prevent the thyristor starter, synchronous motor 8 and the like from being damaged by the ground fault.
- Such thyristor starter is used, for example, in a power plant, to start a synchronous generator which serves as a synchronous motor from a stopped state. After the synchronous generator has been started to rotate at a predetermined number of revolutions as a synchronous motor, the thyristor starter is detached from the synchronous generator, and the synchronous generator is driven by such as a gas turbine to rotate to generate the AC power.
- resistance elements 31 to 33 are connected between AC lines RL, SL and TL, respectively, and node N 31 , resistance element 34 is connected between node N 31 and the line of ground voltage GND, and whether or not a ground fault has occurred is determined on the basis of voltage V 31 across the terminals of resistance element 34 .
- voltage V 31 is approximately 0 V, and when a ground fault has occurred, voltage V 31 becomes significantly greater than 0 V, it is possible to detect the occurrence of a ground fault at a high accuracy.
- a three-phase transformer is not used in the present invention as in the prior art, it is possible to make the thyristor starter compact in size and cheap in price.
- FIG. 4 is a circuit block diagram illustrating the configuration of a ground fault detecting circuit 40 as a comparative example in comparison with the ground fault detecting circuit illustrated FIG. 3 according to the present embodiment.
- ground fault detecting circuit 40 includes resistance elements 41 to 43 , an amplifier 44 and a comparator 45 .
- resistance elements 41 and 42 are connected to input terminals 5 a and 5 b of inverter 5 , respectively, and the other terminals thereof are commonly connected to a node N 41 .
- One terminal resistance element 43 is connected to node N 41 , and the other terminal of resistance element 43 is connected to the line of ground voltage GND.
- Amplifier 44 amplifies a voltage V 41 across the terminals of resistance element 43 .
- Comparator 45 compares a voltage V 44 from amplifier 44 with a predetermined voltage range of VRL to VRH (VRL ⁇ VRH), and outputs signal ⁇ D at a level in accordance with the comparison result.
- signal ⁇ D is set to the “L” level.
- signal ⁇ D is set to the “H” level.
- a point that is grounded (for example, R-phase line RL) is connected to the other terminal of resistance element 43 (the line of ground voltage GND) to form a current flowing loop, and thereby, voltage V 41 is generated across the terminals of resistance element 43 .
- V 44 ⁇ VRL or VRH ⁇ V 44 and thereby, signal ⁇ D is set to the “H” level which is an active level.
- FIG. 5( a ) to FIG. 9( a ) each is a time chart illustrating output voltage V 44 from amplifier 44 (of the comparative example) illustrated in FIG. 4 .
- FIG. 5( b ) to FIG. 9( b ) each is a time chart illustrating output voltage V 35 from amplifier 35 (of the present embodiment) illustrated in FIG. 3 .
- FIG. 5( c ) to FIG. 9( c ) each is a time chart illustrating a voltage Vr of R-phase line RL, a voltage Vs of S-phase line SL and a voltage Vt of T-phase line TL as illustrated in FIG. 2 .
- FIG. 5( d ) to FIG. 9( d ) each is a time chart illustrating a voltage Vn of low-voltage output terminal 3 b of converter 3 (low-voltage output terminal 5 b of inverter 5 ), a voltage Vp 1 of high-voltage output terminal 3 a of converter 3 , and a voltage Vp 2 of high-voltage output terminal 5 a of inverter 5 as illustrated in FIG. 2 .
- Voltages Vr, Vs, Vt, Vp 1 and Vp 2 are the same in the comparative example and in the present embodiment.
- FIG. 5( a ) to FIG. 5( d ) each is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in R-phase line RL at timing to.
- three-phase AC voltages Vr, Vs and Vt all fluctuate with a predetermined amplitude in the normal state.
- R-phase voltage Vr becomes equal to 0 V, and the amplitude of S-phase voltage Vs and T-phase voltage Vt increases.
- each DC voltage of Vn, Vp 1 and Vp 2 does not stay constant but fluctuates with a certain amplitude even in the normal state.
- the amplitude of DC voltages Vn, Vp 1 and Vp 2 increases.
- Output voltage V 44 from amplifier 44 of the comparative example fluctuates in accordance with the voltage obtained by dividing the DC voltage (Vp 2 ⁇ Vn).
- voltage V 44 fluctuates with a certain amplitude even in the normal state, and the amplitude of voltage V 44 increases after a ground fault has occurred in R-phase line RL at timing t 0 .
- the amplitude of voltage V 44 fluctuates before and after timing t 0 , it is possible to detect the occurrence of a ground fault.
- the fluctuation before and after timing t 0 is small, it is not easy to determine the occurrence of a ground fault.
- output voltage V 35 from amplifier 35 is configured to fluctuate in accordance with a voltage obtained by adding up three-phase AC voltages Vr, Vs and Vt.
- voltage V 35 is about 0 V in the normal state, and the amplitude of voltage V 35 increases abruptly after a ground fault has occurred in R-phase line RL at timing t 0 .
- the amplitude of voltage V 35 fluctuates greatly before and after timing t 0 , it is possible to easily determine the occurrence of a ground fault.
- FIG. 6( a ) to FIG. 6( d ) each illustrates the voltage fluctuations before and after the occurrence of a ground fault in high-voltage input terminal 5 a of inverter 5 at timing t 0 .
- each DC voltage of Vn, Vp 1 and Vp 2 does not stay constant but fluctuates with a certain amplitude even in the normal state.
- DC voltage Vp 2 becomes equal to 0 V, and DC voltages Vn and Vp 1 both shift to the negative voltage side.
- three-phase AC voltages Vr, Vs and Vt all fluctuate at a predetermined amplitude. After the ground fault has occurred in high-voltage input terminal 5 a of inverter 5 at timing t 0 , three-phase AC voltages Vr, Vs and Vt all shift to the negative voltage side.
- Output voltage V 44 from amplifier 44 of the comparative example fluctuates in accordance with the voltage obtained by dividing the DC voltage (Vp 2 ⁇ Vn).
- voltage V 44 fluctuates with a certain amplitude even in the normal state, and shifts to the negative voltage side after the ground fault has occurred in high-voltage input terminal 5 a of inverter 5 at timing t 0 .
- voltage V 44 shifts before and after timing t 0 , it is possible to detect the occurrence of a ground fault.
- the fluctuation before and after timing t 0 is small, it is not easy to determine the occurrence of a ground fault.
- the amplitude of voltage V 44 decreases due to the ground fault, making it impossible to determine the occurrence of a ground fault on the basis of the amplitude of voltage V 44 .
- output voltage V 35 from amplifier 35 is configured to fluctuate in accordance with a voltage obtained by adding up three-phase AC voltages Vr, Vs and Vt.
- voltage V 35 is about 0 V in the normal state, and the amplitude of voltage V 35 increases abruptly after a ground fault has occurred in high-voltage input terminal 5 a of inverter 5 at timing t 0 .
- the amplitude of voltage V 35 fluctuates greatly before and after timing t 0 , it is possible to easily determine the occurrence of a ground fault.
- FIG. 7( a ) to FIG. 7( d ) each illustrates the voltage fluctuations before and after the occurrence of a ground fault in low-voltage input terminal 5 b of inverter 5 at timing t 0 .
- each DC voltage of Vn, Vp 1 and Vp 2 does not stay constant but fluctuates with a certain amplitude even in the normal state.
- DC voltage Vn becomes equal to 0 V
- three-phase AC voltages Vr, Vs and Vt all fluctuate at a predetermined amplitude. After the ground fault has occurred in low-voltage input terminal 5 b of inverter 5 at timing t 0 , three-phase AC voltages Vr, Vs and Vt all shift to the positive voltage side.
- Output voltage V 44 from amplifier 44 of the comparative example fluctuates in accordance with the voltage obtained by dividing the DC voltage (Vp 2 ⁇ Vn).
- voltage V 44 fluctuates with a certain amplitude even in the normal state, and shifts to the positive voltage side after the ground fault has occurred in low-voltage input terminal 5 b of inverter 5 at timing to.
- voltage V 44 shifts before and after timing t 0 , it is possible to detect the occurrence of a ground fault.
- the fluctuation before and after timing t 0 is small, it is not easy to determine the occurrence of a ground fault.
- the amplitude of voltage V 44 decreases due to the ground fault, making it impossible to determine the occurrence of a ground fault on the basis of the amplitude of voltage V 44 .
- output voltage V 35 from amplifier 35 is configured to fluctuate in accordance with a voltage obtained by adding up three-phase AC voltages Vr, Vs and Vt.
- voltage V 35 is about 0 V in the normal state, and the amplitude of voltage V 35 increases abruptly after a ground fault has occurred in low-voltage input terminal 5 b of inverter 5 at timing t 0 .
- the amplitude of voltage V 35 fluctuates greatly before and after timing t 0 , it is possible to easily determine the occurrence of a ground fault.
- FIG. 8( a ) to FIG. 8( d ) each illustrates the voltage fluctuations before and after the occurrence of a ground fault in high-voltage input terminal 3 a of converter 3 at timing t 0 .
- each DC voltage of Vn, Vp 1 and Vp 2 does not stay constant but fluctuates with a certain amplitude even in the normal state.
- DC voltage Vp 1 becomes equal to 0 V
- three-phase AC voltages Vr, Vs and Vt all fluctuate at a predetermined amplitude. After the ground fault has occurred in high-voltage input terminal 3 a of converter 3 at timing t 0 , three-phase AC voltages Vr, Vs and Vt all shift to the negative voltage side.
- Output voltage V 44 from amplifier 44 of the comparative example fluctuates in accordance with the voltage obtained by dividing the DC voltage (Vp 2 ⁇ Vn).
- voltage V 44 fluctuates with a certain amplitude even in the normal state, and shifts to the negative voltage side after the ground fault has occurred in high-voltage input terminal 3 a of converter 3 at timing t 0 .
- voltage V 44 shifts before and after timing t 0 , it is possible to detect the occurrence of a ground fault.
- the fluctuation before and after timing t 0 is small, it is not easy to determine the occurrence of a ground fault.
- output voltage V 35 from amplifier 35 is configured to fluctuate in accordance with a voltage obtained by adding up three-phase AC voltages Vr, Vs and Vt.
- voltage V 35 is about 0 V in the normal state, and the amplitude of voltage V 35 increases abruptly after a ground fault has occurred in high-voltage input terminal 3 a of converter 3 at timing t 0 .
- the amplitude of voltage V 35 fluctuates greatly before and after timing t 0 , it is possible to easily determine the occurrence of a ground fault.
- FIG. 9( a ) to FIG. 9( d ) each is a time chart illustrating voltage fluctuations before and after the occurrence of a ground fault in U-phase line UL at timing t 0 .
- three-phase AC voltages Vr, Vs and Vt all fluctuate with a predetermined amplitude in the normal state.
- the amplitude of three-phase voltages Vr, Vs and Vt increases.
- each DC voltage of Vn, Vp 1 and Vp 2 does not stay constant but fluctuates with a certain amplitude even in the normal state.
- the amplitude of DC voltages Vr, Vs and Vt increases.
- Output voltage V 44 from amplifier 44 of the comparative example fluctuates in accordance with the voltage obtained by dividing the DC voltage (Vp 2 ⁇ Vn).
- voltage V 44 fluctuates with a certain amplitude even in the normal state, and the amplitude of voltage V 44 increases after a ground fault has occurred in U-phase line UL at timing to.
- the amplitude of voltage V 44 fluctuates before and after timing t 0 , it is possible to detect the occurrence of a ground fault.
- the fluctuation before and after timing t 0 is small, it is not easy to determine the occurrence of a ground fault.
- output voltage V 35 from amplifier 35 is configured to fluctuate in accordance with a voltage obtained by adding up three-phase AC voltages Vr, Vs and Vt.
- voltage V 35 is about 0 V in the normal state, and the amplitude of voltage V 35 increases abruptly after a ground fault has occurred in U-phase line UL at timing t 0 .
- the amplitude of voltage V 35 fluctuates greatly before and after timing t 0 , it is possible to easily determine the occurrence of a ground fault.
- FIG. 10 is a circuit block diagram illustrating the configuration of a ground fault detecting circuit 50 according to a modification of the present embodiment in comparison with the ground fault detecting circuit illustrated in FIG. 3 .
- ground fault detecting circuit 50 according to the modification is achieved by adding an absolute value calculator 51 and a filter circuit 52 between amplifier 35 and comparator 36 in ground fault detecting circuit 6 as illustrated in FIG. 3 .
- Absolute value calculator 51 calculates an absolute value
- Filter circuit 52 is a low pass filter for removing high frequency components from voltage V 51 output from absolute value calculator 51 .
- Comparator 36 compares a voltage V 52 output from filter circuit 52 with a predetermined reference voltage VR, and outputs signal ⁇ D at a level in accordance with the comparison result.
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- General Physics & Mathematics (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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PCT/JP2012/059670 WO2013153596A1 (ja) | 2012-04-09 | 2012-04-09 | 地絡検出回路およびそれを用いた電力変換装置 |
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Cited By (3)
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Citations (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3665495A (en) * | 1970-06-01 | 1972-05-23 | Power Systems And Controls Inc | No break power system |
JPS5041036A (ja) | 1973-08-15 | 1975-04-15 | ||
JPS55147930A (en) | 1979-05-08 | 1980-11-18 | Tokyo Shibaura Electric Co | Induction generator motor device |
US4430683A (en) * | 1981-02-27 | 1984-02-07 | Hitachi, Ltd. | Ground fault detecting device for use with a DC circuit |
US4475150A (en) * | 1982-04-28 | 1984-10-02 | General Electric Company | Coordinated load commutated inverter protection system |
US4618810A (en) * | 1983-02-04 | 1986-10-21 | Emerson Electric Company | Variable speed AC motor control system |
JPS63265516A (ja) | 1987-04-22 | 1988-11-02 | Hitachi Ltd | 三相交流励磁装置 |
US4825327A (en) * | 1987-11-12 | 1989-04-25 | General Electric Company | Negative and zero sequence directional overcurrent unit for AC power transmission line protection |
US5185685A (en) * | 1991-03-28 | 1993-02-09 | Eaton Corporation | Field sensing arc detection |
US5214575A (en) * | 1990-12-14 | 1993-05-25 | Mitsubishi Denki Kabushiki Kaisha | Ground fault detector for an inverter and a method therefor |
JPH0984254A (ja) | 1995-09-14 | 1997-03-28 | Omron Corp | 電源装置、インバータ装置および分散型電源装置 |
US5754114A (en) * | 1996-08-26 | 1998-05-19 | Delco Electronics Corporation | Safety ground detector |
US5963406A (en) * | 1997-12-19 | 1999-10-05 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
US20010048310A1 (en) * | 2000-05-30 | 2001-12-06 | International Rectifier Corporation | Motor insulation fault detection by sensing ground leak current |
JP2003061380A (ja) | 2001-08-10 | 2003-02-28 | Toshiba Corp | 同期機のサイリスタ起動装置 |
US20030197989A1 (en) * | 2002-04-05 | 2003-10-23 | Smc Electrical Products, Inc. | Method and apparatus for high impedance grounding of medium voltage AC drives |
US20050047035A1 (en) * | 2003-08-29 | 2005-03-03 | Abb Inc. | Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode |
US20050099743A1 (en) * | 2003-11-11 | 2005-05-12 | Lg Industrial Systems Co., Ltd. | Ground fault detection system and method for inverter |
US20050280422A1 (en) | 2004-06-18 | 2005-12-22 | Kokusan Denki Co., Ltd. | Electric leakage detection system |
US20060001392A1 (en) * | 2004-06-30 | 2006-01-05 | Toshiyuki Ajima | Motor drive apparatus, electric actuator and electric power steering apparatus |
US6984988B2 (en) * | 2002-10-16 | 2006-01-10 | Yazaki Corporation | Ground-fault detecting device and insulation resistance measuring device |
US20060056206A1 (en) * | 2004-09-10 | 2006-03-16 | Mitsubishi Denki Kabushiki Kaisha | Fault detection system for inverter |
US20070211396A1 (en) * | 2006-03-09 | 2007-09-13 | Omron Corporation | Ground fault detection device for motor driving circuit |
US20090051427A1 (en) * | 2007-08-20 | 2009-02-26 | Rohm Co., Ltd. | Output limiting circuit, class d power amplifier and audio equipment |
JP2009131048A (ja) | 2007-11-22 | 2009-06-11 | Mitsubishi Electric Corp | 複数発電機の起動システムおよび複数発電機起動用切替盤 |
US20090167314A1 (en) | 2006-02-07 | 2009-07-02 | Siemens Aktiengesellschaft | Method and Device for Detecting Ground Faults in a Supply Cable |
US20100097733A1 (en) * | 2007-12-14 | 2010-04-22 | E Tomimbang Wendell | Arc fault circuit interrupter, systems, apparatus and methods of detecting and interrupting electrical faults |
JP2010130704A (ja) | 2008-11-25 | 2010-06-10 | Mitsubishi Electric Corp | 発電機の起動装置 |
US20110080676A1 (en) * | 2009-10-06 | 2011-04-07 | Takeshi Yoshida | Ground fault sensing device |
JP2011130634A (ja) | 2009-12-21 | 2011-06-30 | Mitsubishi Electric Corp | 非接地発電機の地絡保護システム |
US20110241590A1 (en) * | 2010-03-31 | 2011-10-06 | Fanuc Corporation | Motor driving apparatus having fault diagnostic function |
US20110307196A1 (en) * | 2010-06-11 | 2011-12-15 | Schumacher Ryan W | System and method for ground isolation detection in a vehicle |
US20110316460A1 (en) * | 2010-06-28 | 2011-12-29 | Ikuo Yasuoka | Vehicle control system |
JP2012039711A (ja) | 2010-08-05 | 2012-02-23 | Mitsubishi Electric Corp | 二重給電同期機の地絡検出装置 |
US20120043967A1 (en) * | 2009-09-29 | 2012-02-23 | Hitachi Vehicle Energy, Ltd. | Ground Fault Detection Circuit, and Power Supply Device |
US20120089266A1 (en) * | 2009-12-18 | 2012-04-12 | Tomimbang Wendell E | System and integrated method for a parallel and series arc fault circuit interrupter |
JP2012119244A (ja) * | 2010-12-03 | 2012-06-21 | Panasonic Corp | 燃料電池システム |
US20130314013A1 (en) * | 2012-05-25 | 2013-11-28 | Hitachi Automotive Systems, Ltd. | Motor Driving Control Apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5917620B2 (ja) * | 1977-02-16 | 1984-04-23 | 株式会社日立製作所 | インバ−タの保護装置 |
DE3923594A1 (de) * | 1988-07-29 | 1990-02-01 | Siemens Ag | Erdschlussueberwachungseinrichtung fuer drehstromantriebe, die ueber umrichter gespeist werden |
US6977518B2 (en) * | 2002-11-11 | 2005-12-20 | Matsushita Electric Works, Ltd. | Electrical leak detecting apparatus |
EP2256506B1 (de) * | 2009-05-27 | 2019-07-03 | Bender GmbH & Co. KG | Verfahren und Vorrichtung zur Isolationsüberwachung von ungeerdeten Gleich- und Wechselspannungsnetzen |
-
2012
- 2012-04-09 JP JP2014509916A patent/JP6126081B2/ja active Active
- 2012-04-09 EP EP12874321.8A patent/EP2837942B1/en active Active
- 2012-04-09 WO PCT/JP2012/059670 patent/WO2013153596A1/ja active Application Filing
- 2012-04-09 US US14/390,118 patent/US9606163B2/en active Active
Patent Citations (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3665495A (en) * | 1970-06-01 | 1972-05-23 | Power Systems And Controls Inc | No break power system |
JPS5041036A (ja) | 1973-08-15 | 1975-04-15 | ||
JPS55147930A (en) | 1979-05-08 | 1980-11-18 | Tokyo Shibaura Electric Co | Induction generator motor device |
US4430683A (en) * | 1981-02-27 | 1984-02-07 | Hitachi, Ltd. | Ground fault detecting device for use with a DC circuit |
US4475150A (en) * | 1982-04-28 | 1984-10-02 | General Electric Company | Coordinated load commutated inverter protection system |
US4618810A (en) * | 1983-02-04 | 1986-10-21 | Emerson Electric Company | Variable speed AC motor control system |
JPS63265516A (ja) | 1987-04-22 | 1988-11-02 | Hitachi Ltd | 三相交流励磁装置 |
US4825327A (en) * | 1987-11-12 | 1989-04-25 | General Electric Company | Negative and zero sequence directional overcurrent unit for AC power transmission line protection |
US5214575A (en) * | 1990-12-14 | 1993-05-25 | Mitsubishi Denki Kabushiki Kaisha | Ground fault detector for an inverter and a method therefor |
US5185685A (en) * | 1991-03-28 | 1993-02-09 | Eaton Corporation | Field sensing arc detection |
JPH0984254A (ja) | 1995-09-14 | 1997-03-28 | Omron Corp | 電源装置、インバータ装置および分散型電源装置 |
US5754114A (en) * | 1996-08-26 | 1998-05-19 | Delco Electronics Corporation | Safety ground detector |
US5963406A (en) * | 1997-12-19 | 1999-10-05 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
US6339525B1 (en) * | 1997-12-19 | 2002-01-15 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
US20010048310A1 (en) * | 2000-05-30 | 2001-12-06 | International Rectifier Corporation | Motor insulation fault detection by sensing ground leak current |
US6593751B2 (en) * | 2000-05-30 | 2003-07-15 | International Rectifier Corporation | Motor insulation fault detection by sensing ground leak current |
JP2003061380A (ja) | 2001-08-10 | 2003-02-28 | Toshiba Corp | 同期機のサイリスタ起動装置 |
US20030197989A1 (en) * | 2002-04-05 | 2003-10-23 | Smc Electrical Products, Inc. | Method and apparatus for high impedance grounding of medium voltage AC drives |
US6984988B2 (en) * | 2002-10-16 | 2006-01-10 | Yazaki Corporation | Ground-fault detecting device and insulation resistance measuring device |
US20050047035A1 (en) * | 2003-08-29 | 2005-03-03 | Abb Inc. | Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode |
US7154277B2 (en) * | 2003-08-29 | 2006-12-26 | Abb Inc. | Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode |
US20050099743A1 (en) * | 2003-11-11 | 2005-05-12 | Lg Industrial Systems Co., Ltd. | Ground fault detection system and method for inverter |
US7233465B2 (en) * | 2003-11-11 | 2007-06-19 | Lg Industrial Systems Co., Ltd. | Ground fault detection system and method for inverter |
US20050280422A1 (en) | 2004-06-18 | 2005-12-22 | Kokusan Denki Co., Ltd. | Electric leakage detection system |
US20060001392A1 (en) * | 2004-06-30 | 2006-01-05 | Toshiyuki Ajima | Motor drive apparatus, electric actuator and electric power steering apparatus |
US20060056206A1 (en) * | 2004-09-10 | 2006-03-16 | Mitsubishi Denki Kabushiki Kaisha | Fault detection system for inverter |
US20090167314A1 (en) | 2006-02-07 | 2009-07-02 | Siemens Aktiengesellschaft | Method and Device for Detecting Ground Faults in a Supply Cable |
JP2009526203A (ja) | 2006-02-07 | 2009-07-16 | シーメンス アクチエンゲゼルシヤフト | 給電ケーブルの地絡検出方法および装置 |
US20070211396A1 (en) * | 2006-03-09 | 2007-09-13 | Omron Corporation | Ground fault detection device for motor driving circuit |
US20090051427A1 (en) * | 2007-08-20 | 2009-02-26 | Rohm Co., Ltd. | Output limiting circuit, class d power amplifier and audio equipment |
JP2009131048A (ja) | 2007-11-22 | 2009-06-11 | Mitsubishi Electric Corp | 複数発電機の起動システムおよび複数発電機起動用切替盤 |
US20100097733A1 (en) * | 2007-12-14 | 2010-04-22 | E Tomimbang Wendell | Arc fault circuit interrupter, systems, apparatus and methods of detecting and interrupting electrical faults |
JP2010130704A (ja) | 2008-11-25 | 2010-06-10 | Mitsubishi Electric Corp | 発電機の起動装置 |
US20120043967A1 (en) * | 2009-09-29 | 2012-02-23 | Hitachi Vehicle Energy, Ltd. | Ground Fault Detection Circuit, and Power Supply Device |
US20110080676A1 (en) * | 2009-10-06 | 2011-04-07 | Takeshi Yoshida | Ground fault sensing device |
US20120089266A1 (en) * | 2009-12-18 | 2012-04-12 | Tomimbang Wendell E | System and integrated method for a parallel and series arc fault circuit interrupter |
JP2011130634A (ja) | 2009-12-21 | 2011-06-30 | Mitsubishi Electric Corp | 非接地発電機の地絡保護システム |
US20110241590A1 (en) * | 2010-03-31 | 2011-10-06 | Fanuc Corporation | Motor driving apparatus having fault diagnostic function |
US20110307196A1 (en) * | 2010-06-11 | 2011-12-15 | Schumacher Ryan W | System and method for ground isolation detection in a vehicle |
US20110316460A1 (en) * | 2010-06-28 | 2011-12-29 | Ikuo Yasuoka | Vehicle control system |
JP2012039711A (ja) | 2010-08-05 | 2012-02-23 | Mitsubishi Electric Corp | 二重給電同期機の地絡検出装置 |
JP2012119244A (ja) * | 2010-12-03 | 2012-06-21 | Panasonic Corp | 燃料電池システム |
US20130314013A1 (en) * | 2012-05-25 | 2013-11-28 | Hitachi Automotive Systems, Ltd. | Motor Driving Control Apparatus |
Non-Patent Citations (5)
Title |
---|
"Thyristor Starter Used in Thermal Power Station", Mitsubishi Electric Technical Report, Mitsubishi Denki GIHO, vol. 67, No. 5, 1993, 9 pages (with partial English-language translation). |
"Thyristor Starter Used in Thermal Power Station", Mitsubishi Electric Technical Report, Mitsubishi Denki Giro, vol. 67, No. 5, 1993, 9 pages (with partial English-language translation). |
Extended European Search Report issued on May 13, 2016 in European Patent Application No. 12874321.8. |
International Search Report issued May 22, 2012, in PCT/JP2012/059670, filed Apr. 9, 2012. |
Office Action issued on Nov. 17, 2015 in Japanese Patent Application No. 2014-509916 with English translation. |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20170187189A1 (en) * | 2015-12-28 | 2017-06-29 | King Fahd University Of Petroleum And Minerals | Fault ride-through and power smoothing system |
US9941702B2 (en) * | 2015-12-28 | 2018-04-10 | King Fahd University Of Petroleum And Minerals | Fault ride-through and power smoothing system |
US10756532B2 (en) | 2018-07-13 | 2020-08-25 | Kohler Co. | Ground fault minimization |
US10848053B2 (en) | 2018-07-13 | 2020-11-24 | Kohler Co. | Robust inverter topology |
US11600988B2 (en) | 2018-07-13 | 2023-03-07 | Kohler Co. | Ground fault minimization |
Also Published As
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EP2837942A4 (en) | 2016-06-15 |
EP2837942B1 (en) | 2019-08-21 |
JPWO2013153596A1 (ja) | 2015-12-17 |
EP2837942A1 (en) | 2015-02-18 |
US20150130379A1 (en) | 2015-05-14 |
JP6126081B2 (ja) | 2017-05-10 |
WO2013153596A1 (ja) | 2013-10-17 |
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